In 1981, Mosport Park hosted the Molson Canadian 1000, a six-hour contest for the FIA World Endurance Championship of Drivers and the IMSA GT Series.
In addition to the Mosport event, the two race organizations shared North American race dates at Daytona International Speedway, Sebring International
Raceway, Riverside International Raceway, Watkins Glen International and Road America.
The World Endurance Championship for Drivers season began in January with the first of two visits to Daytona International Speedway. After Daytona, teams stayed in Florida to compete in the 12-Hours of Sebring. Then the championship returned to Europe for races at Mugello and Monza before travelling across the Atlantic for an event at Riverside International Raceway. Back in Europe, races were conducted at Silverstone, Nurburging, the 24-Hours of Le Mans and Coppa Forio. Then championship went back to North America for stops at Daytona and Watkins Glen International. The 24-hours of Spa-Francorchamps took place in late July and was followed by Mosport Park and Road America. The finale was held at Brands Hatch.
Six of these events – the 24-Hours of Daytona, Monza 1000-km, Silverstone 6-Hours, Nurburgring 1000-km, 24-Hours of Le Mans and Watkins Glen 6-Hour – counted towards the World Endurance Championship of Makes.
The IMSA GT Series also kicked off with the 24-Hour event at Daytona International Speedway. Next on the schedule were the 12-Hours of Sebring followed by Road Atlanta, Riverside International Raceway, Laguna Seca, Lime Rock Park, Mid-Ohio Sports Car Course, Brainerd International Raceway and a second stop at Daytona. Prior to the 6-hour event at Mosport in August, the teams visited Sears Point Raceway and Portland International Raceway. After the series only Canadian event, the championship competed at Road America and returned to Road Atlanta, followed by the penultimate race of 1981 at Pocono Raceway. Daytona hosted the final contest of the season.
Competitors in the IMSA GT Series collect points in the GTU, GTO or GTX divisions.
Round thirteen for the FIA World Endurance Championship of Drivers and race twelve for the IMSA GT Series were conducted during the Molson Canadian 1000 at Mosport Park. Teams would compete in a six-hour contest around the ten turn 2.459-mile road course.
|A field of thirty-three drivers enter Mosport Park’s turn ten in anticipation of the start of the Molson Canadian 1000. Getting a jump is the pole-winning No. 3 Andial Meister Racing Porsche 935 shared by Harald Grohs and Rolf Stommelen. On the outside is the No. 0 Interscope Racing Porsche 935 K3 driven by Bill Whittington and team owner Ted Field. In the second row are the JLP Racing Porsche and Chris Cord Lola.|
|The No. 3 Andial Meister Racing Porsche 935 was driven by Rolf Stommelen and Harald Grohs. Stommelen earned his first podium of the season in round six at Lime Rock Park. The pairing of Stommelen and Grohs started on the pole at Mosport and shot into an early lead. During the race, they faced challenges from the JLP Racing, Fitzpatrick Racing and the Cooke Woods Lola but held on for the victory.|
|One of the new generation GTP cars was entered by Cooke Woods Racing. Sharing the No. 7 Lola T-600 at the Molson Canadian 1000 were Brian Redman and former Trans Am champion Eppie Wietzes. Rain and mechanical issues prevented the team from qualifying. Despite starting from the rear, Redman passed seventeen cars on the opening lap. A penalty and incident with a back-marker resulted in a second-place result.|
|Capturing the GTO honours in round twelve at Mosport Park were Dave Cowart and Kenper Miller. The team did not hit their stride until race three at Road Atlanta, where Cowart scored the class victory in the No.25 Red Lobster sponsored BMW M1. They went on to win seven of the next eight races. At Mosport, the BMW qualified eleventh overall and first in class. In earning the victory, the duo finished fifth overall.|
|The No. 92 Kent Racing prepared Mazda RX-7 was driven by Lee Mueller and the defending GTU champion, Walt Bohren. The pair won the GTU category at the 12-Hours of Sebring and in a solo drive, Mueller was victorious at Brainerd. They were dominant in round twelve at Mosport Park. The duo qualified first in class and finished ninth overall - winning the GTU class by a three-lap margin.|
|To date, the highlight of Interscope Racing’s Ted Field was a runner-up result in a sprint race at Lime Rock Park. Field and his regular co-driver, Danny Ongias, were not having the same results as they enjoyed during previous seasons. The No. 0 Porsche 935 was shared by Field and Bill Whittington in round twelve. The Porsche started on the outside of the front and finished third but was never a factor during the race.|
|Dick Barbour Racing closed their operation and the reigning IMSA GTX champion, John Fitzpatrick, was forced to form his own team. The first two rounds of the season were a disaster, but Fitzpatrick returned to the winners circle at Road Atlanta and Riverside. At Mosport, he was paired with Jim Busby. The No. 1 Porsche started in the fifth spot and took a turn out front but would finish eleven laps behind the leaders in sixth.|
|John Paul Sr. and Jr. started their 1981 campaign with retirements at Daytona and Sebring. By round four at Riverside, they were on the podium. Paul Jr. collected a couple more rostrum finishes in the sprint races. During the qualifying session at Mosport Park, the No. 18 JLP Racing Porsche 935 K3 was the third fastest. Paul Jr. moved into the lead during the first hour but crashed the car in turn four and retired.|
|The GTX BMW M1 entered by BMW Motorsports set the fastest lap at Lime Rock but wasn’t always reliable. David Hobbs’ best result to date was a fourth at Portland. Hobbs and his co-driver Hans Stuck were gridded seventh for the start of the six-hour event. Hobbs drove the first stint but pitted several times to repair a sticking throttle. Problems continued throughout the contest and they finished fourteenth.|
|1||GTX||Stommelen / Grohs||Porsche 935 K3||Andial Meister Racing||229||-|
|2||GTX||Redman / Wietzes||Lola T-600||Cooke Woods Racing||229||-|
|3||GTX||Field / Whittington||Porsche 935K3||Interscope Racing||222||-|
|4||GTX||Henn / Doren||Porsche 935K3||Preston Henn||219||-|
|5||GTO||Miller / Cowart||BMW M1||Red Lobster Racing||218||-|
|6||GTX||Fitzpatrick / Busby||Porsche 935 K3||John Fitzpatrick Racing||217||-|
|7||GTX||DeNarvaez / Garretson||Porsche 935||DeNarvaez Racing||215||-|
|8||GTO||Garcia / Naon / Cruz||BMW M1||Montura Racing||210||-|
|9||GTU||Bohren / Mueller||Mazda RX-7||Kent Racing||209||-|
|10||GTX||Jamsal / Galdamez||Porsche 935||Scorpio Racing||206||-|
|11||GTU||Davenport / Carney||Datsun 280ZX||Raytown Datsun||206||-|
|12||GTU||McKitterick / Akin||Porsche 935 K3||Bob Akin Racing||205||-|
|13||GTU||Winters / Bergstrom||Porsche 924 Carrera GTR||Whitehall Capital||203||-|
|14||GTX||Hobbs / Stuck||BMW M1||BMW Motorsport||192||Transmission|
|15||GTO||Heimrath / Heimrath, Jr||Porsche 924 Carrera GTR||Heimrath Racing||186||-|
|16||GTO||Romero / Febles||Porsche 935||Pepe Romero||185||-|
|17||GTO||Aschenbrenner / Tescher||Porsche 914/6||Alps Restoration||182||-|
|18||GTO||Bulkowski / Berhar||Triumph TR8||Peter Bulkowski||182||-|
|NRAF||GTX||Bartling / Hochreuter / Ridgely||Porsche Carrera||Fritz Hochreuter||170||-|
|20||GTX||Deacon / Freberg||BMW M1||David Deacon Racing||168||-|
|21||GTO||Vincentz / Bell||Porsche 934||Electrodyne Racing||145||-|
|22||GTU||Lax / Lansberg / Moennick||Porsche 911||Stephen Lax Racing||141||Accident|
|23||GTU||Overby / Baker||Porsche 914/6||Personalized Autohaus||139||-|
|24||GTO||Kjoller / Kjoller||Porsche Carrera||Russell Porsche||123||-|
|25||GTU||Blackburn / Frellsen||Datsun 280ZX||Logan Blackburn Racing||122||-|
|26||GTX||Moretti / Rahal||Porsche 935||Momo/Penthouse||105||Accident|
|27||GTX||Carter / Adam||Chevrolet Camaro||Maurice Carter Racing||105||Accident|
|28||GTU||Baker / Overby||Porsche 914/4||Personalized Autohaus||95||-|
|29||GTX||Cord / Adams||Lola T-600||Chris Cord Racing||56||Engine|
|30||GTX||Paul / Paul, Jr||Porsche 935 JLP-3||JLP Racing||41||Accident|
|31||GTO||Stiff / Honegger / Posey||Mazda RX-7||Z & W Enterprises||34||Accident|
|32||GTX||Russo Taylor / Taylor||Chevron GTP Buick||Janis Taylor||4||Accident|
|33||GTU||Bye / Bieri||Porsche 911||Hi-Fi Express||0||-|
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